Code window width doesn't re-size with browser (BB-8837)

The width of the code window does not re-size with the browser width. If the file being reviewed contains lines of code that exceed the width of the code window and the file is longer vertically than the page, this requires you to scroll down to the bottom of the file and lose your place just to scroll over horizontally.

This makes it very hard to review code that runs off the screen horizontally.

If the code window can't be re-sized, perhaps a word-wrap feature could be added.